Eleanor Maguire, David Gadian, Ingrid Johnsrude, Catriona Good, John Ashburner,Richard Frackowiak, and Christopher Frith of University College London, for presenting evidence that the brains of London taxi drivers are more highly developed than those of their fellow citizens.

Reference

"Navigation-Related Structural Change In the Hippocampi of Taxi Drivers" Proceedings of the National Academy of Sciences, vol. 97, no. 8, April 11, 2000, pp. 4398-403. Also see their subsequent publications.